Sorry, it's slow

Try to print (stream) some file from Octoprint (not from Smoothie's SD card). You may notice that it streams gcode awkwardly slow even on a fast network connection. That's how it happens for some of the users. That means you should prefer USB to Ethernet connection.

It might be woking for you. Please leave a note somewhere if the speed is fine via socat.

Still you can upload to SD (slow too: 1 MB/min for some users) and use Octoprint to start / stop jobs and control printer status